4-8 Ohms - What does that mean

JammyBStard · 31st December 2011, 12:06 PM

Quick Question:

If my Eltax Monitor III speakers State 4-8 Ohms on the back what impedance are they?

GDO · 31st December 2011, 12:58 PM

It means: Don't worry about my impedance. It is ok enough for whatever amp you might be using.

JammyBStard · 31st December 2011, 01:24 PM

So it means it's at least 8-Ohms then?

They've been sat on a shelf doing nothing for years; I've just pared them with a new TA2021B based T-Amp and I was wondering how they should stack up in theory. They sound supprisingly good actually.
The specs and internet myth of the TA2021B suggest it would be working at it's best into 4 Ohm and/or a hig-efficiency pair of speakers. The 89dB Monitor III are really doing the job for near-field.

DrDyna · 31st December 2011, 01:26 PM

It means that the impedance varies with frequency as it does in most speakers. You should make sure that whatever amplifier you use is stable at 4 ohms.

GDO · 31st December 2011, 01:49 PM

For nearfield home use, i have never found impedance/power/sensitivity being a problem for any amp and any speaker.

KatieandDad · 31st December 2011, 01:52 PM

If you were to look at their impedance over the audio band you would be surprised. 2 Ohms to over 2K Ohms is not uncommon.

This, in part, is why Class D amps need to be matched to the speakers, whereas Class A is much more forgiving.

system7 · 31st December 2011, 01:56 PM

I'd say that's a 4 ohm loudspeaker! LOL

Eltax Monitor III Bookshelf Loudspeakers | Hi-Fi

Nothing like seeing the actual impedance curve!

Keriwena · 31st December 2011, 02:16 PM

I'm going to guess it means 4 ohms when bridged, 8 ohms each when bi-wired.

KatieandDad · 31st December 2011, 02:21 PM

Quote:

Originally Posted by Keriwena

I'm going to guess it means 4 ohms when bridged, 8 ohms each when bi-wired.

The impedance of the speaker doesnt change in Bridged or Parallel or Series modes.

The important thing is what is being presesnted to the amplifier.

The speaker manufacturer here is saying that these speakers will suit amps that require any load between 4 and 8 Ohms.

Charles Darwin · 31st December 2011, 04:15 PM

No idea what 4-8 Ohm means with these.

The other speakers I know which state '4-8 Ohm' were the large 215DMT & FSM Tannoys but with these the user could choose to run the extra 15" in parallel with the 15" DC or as a 3 way so it did make sense.

31st December 2011, 12:06 PM	#1
JammyBStard diyAudio Member Join Date: Feb 2008 Location: York, UK	4-8 Ohms - What does that mean Quick Question: If my Eltax Monitor III speakers State 4-8 Ohms on the back what impedance are they?

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31st December 2011, 12:58 PM	#2
GDO diyAudio Member Join Date: Jul 2009	It means: Don't worry about my impedance. It is ok enough for whatever amp you might be using.

31st December 2011, 01:24 PM	#3
JammyBStard diyAudio Member Join Date: Feb 2008 Location: York, UK	So it means it's at least 8-Ohms then? They've been sat on a shelf doing nothing for years; I've just pared them with a new TA2021B based T-Amp and I was wondering how they should stack up in theory. They sound supprisingly good actually. The specs and internet myth of the TA2021B suggest it would be working at it's best into 4 Ohm and/or a hig-efficiency pair of speakers. The 89dB Monitor III are really doing the job for near-field.

31st December 2011, 01:26 PM	#4
DrDyna diyAudio Member Join Date: May 2007 Blog Entries: 3	It means that the impedance varies with frequency as it does in most speakers. You should make sure that whatever amplifier you use is stable at 4 ohms.

31st December 2011, 01:49 PM	#5
GDO diyAudio Member Join Date: Jul 2009	For nearfield home use, i have never found impedance/power/sensitivity being a problem for any amp and any speaker.

31st December 2011, 01:52 PM	#6
KatieandDad diyAudio Member Join Date: Nov 2011 Location: UK	If you were to look at their impedance over the audio band you would be surprised. 2 Ohms to over 2K Ohms is not uncommon. This, in part, is why Class D amps need to be matched to the speakers, whereas Class A is much more forgiving.

31st December 2011, 01:56 PM	#7
system7 diyAudio Member Join Date: Aug 2008	I'd say that's a 4 ohm loudspeaker! LOL Eltax Monitor III Bookshelf Loudspeakers \| Hi-Fi Nothing like seeing the actual impedance curve!

31st December 2011, 02:16 PM	#8
Keriwena diyAudio Member Join Date: Feb 2010 Location: in half space	I'm going to guess it means 4 ohms when bridged, 8 ohms each when bi-wired.

31st December 2011, 04:15 PM	#10
Charles Darwin diyAudio Member Join Date: Nov 2009 Location: Birmingham, UK	No idea what 4-8 Ohm means with these. The other speakers I know which state '4-8 Ohm' were the large 215DMT & FSM Tannoys but with these the user could choose to run the extra 15" in parallel with the 15" DC or as a 3 way so it did make sense.

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